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Respiratory Protective Equipment

Respiratory Protective Equipment. Types of RPE. 1. Respirators Designed to purify respirable air by inhaling it through a medium which removes the contaminants 2. Breathing Apparatus Supplies pure respirable air from an uncontaminated source. Types of Respirator.

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Respiratory Protective Equipment

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  1. Respiratory Protective Equipment

  2. Types of RPE 1. Respirators • Designed to purify respirable air by inhaling it through a medium which removes the contaminants 2. Breathing Apparatus • Supplies pure respirable air from an uncontaminated source

  3. Types of Respirator • Filtering Facepiece Respirator • Half-mask Respirator • Full-face Respirator • Powered Clean-air Respirator • Powered Visor Respirator

  4. Filtering Facepiece Respirator • Piece of filtering material worn over the nose & mouth and secured by twin elastic headbands (MEMS) • Cheap & disposable • Face seal cannot be fully achieved over facial hair

  5. Half-mask Respirator • Flexible facepiece which covers nose & mouth, to which is fixed a replaceable cartridge capable of removing airborne contaminants during inhalation • Single or twin cartridges • Facial hair reduces efficiency • Breathing is not easy • Speech and vision are slightly reduced

  6. Full-face Respirator • Cover mouth, nose & eyes • Replaceable canisters which are either fitted to the facepiece or connected via a flexible corrugated rubber breathing tube • Canisters are for specific hazards

  7. Powered Clean-air Respirator • Respirator air is pumped into facepiece • Positive pressure which reduces fatigue, allows longer work periods and reduces risk of leaks • Designs are either half or full-face, or helmets with a fabric skirt • Cannot be used in oxygen deficient areas

  8. Powered Visor Respirator • Purified air is blown down over the user’s face behind a protective visor • Contaminated air is drawn through a pre-filter and then into a filter bag before it is directed over the face • It is powered by nickel cadmium batteries

  9. Types of Breathing Apparatus • Fresh Air Hose Apparatus • Compressed Airline Apparatus • Constant flow • Demand flow • Self-Contained Apparatus • Escape BA • General BA • Oxygen BA

  10. Nominal Protection Factor • Npf=Concentration of atmospheric contaminant Concentration of contaminant in facepiece • The higher the npf, the greater the the degree of protection

  11. Typical NPFs Filtering face piece 5 Half-mask 10 Full-facepiece 500-1000 Powered Clean Air 500 Powered Visor 10-20 Fresh Air Hose 50 Compressed Airline 1000-2000 Self Contained 2000

  12. Selection • Selection of RPE is based on: • Type of hazard; • Contaminant concentration safely tolerated by user; and • Contaminant concentration • The concept of NPF is based on the fact that ingress of contaminant into RPE may (and can) occur

  13. Face-fit Test • Stated NPF value is not reached in practice, due to poor fit • User should carry out test each time RPE is put on: • Close inlet to facepiece • Inhale gently to create negative pressure • Hold breath for 10-15 seconds • If pressure is lost, then headbands may need tightening to increase seal

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